WASHINGTON (AP) — In March 2007, retired FBI agent Robert Levinson flew to Kish Island, an Iranian resort awash with tourists, smugglers and organized crime figures. Days later, after an arranged meeting with an admitted killer, he checked out of his hotel, slipped into a taxi and vanished. For years, the U.S. has publicly described him as a private citizen who traveled to the tiny Persian Gulf island on private business.

[...]The AP first confirmed Levinson's CIA ties in 2010 and continued reporting to uncover more details. It agreed three times to delay publishing the story because the U.S. government said it was pursuing promising leads to get him home.